... T1 - Helical CT angiography of the pulmonary arteries. Objectives To investigate the feasibility of high-pitch CT pulmonary angiography (CTPA) in 3rd generation dual-source CT (DSCT) in unselected patients. Background: Considering the importance of using more appropriate imaging technique for accurate diagnosis of pulmonary thromboembolism (PTE) with less side effects, we aimed to evaluate the quality of pulmonary 64-multidetector computed tomographic (MDCT) angiography in pregnant and postpartum women with suspected PTE in Isfahan. PE is a potentially fatal disease in which a thrombus is lodged into a pulmonary artery blocking blood flow and potentially leading to respiratory distress, acute right cardiac failure or death. CTPA was introduced in the 1990s as an alternative to ventilation/perfusion scanning, which relies on radionuclide imaging of the blood vessels of the lung. In this presentation, we discuss scanning technique and present a simple, systematic, stepwise approach to the interpretation of these studies. Pulmonary angiography is a test to see how blood flows through the lung. Computed tomographic pulmonary angiography (CTPA) is considered the gold standard for the diagnosis of pulmonary embolism (PE). CT angiography may provide more precise anatomical details than other angiography exams such as conventional catheter angiography and magnetic resonance imaging (MRI). The scans were modified to create reduced anatomic coverage scans extending from … The resulting in crease in image noise is compensated by the Since then, several groups of investigators in the United States and Europe have reported high accuracy of the technique (compared with sonography) for the diagnosis or exclusion of deep venous thrombosis (DVT) in the inguinal regions and thighs. Burge et al. The rapid progress in cross-sectional imaging techniques offers a great help in the development of a reliable, accurate, and readily available technique for diagnosing pulmonary embolism , . The specifics will vary depending on CT hardware and software, radiologists' and referrers' preferences, institutional protocols, patient factors (e.g. This was a retrospective study. rule-out CT is not recommended due to the low diagnostic yield. Pulmonary angiography is a radiographic technique in which a catheter is guided from a systemic vein through the right atrium and ventricle and into the main pulmonary artery or one of its branches. In addition, this article will illustrate the diagnostic criteria of acute and chronic pulmonary emboli. It makes too difficult to diagnose PE sometimes. ! MATERIALS AND METHODS: 24 consecutive patients suspected PE underwent CTPAs using a 64-detector MDCT. Pulmonary Arteries. SCTA is based on continuous computed tomography (CT) data acquisition during patient transport through the rotating X‐ray tube and detector system, where … [Figure][1] The purpose of this study is to evaluate three injection protocols for CTPA to improve the image quality of rPA. Computed tomography angiography (also called CT angiography or CTA) is a computed tomography technique used to visualize arterial and venous vessels throughout the body. NB: This article is intended to outline some general principles of protocol design. Further reduction in radiation and contrast medium doses is necessary. Since CTPA is the first imaging modality in detecting PE in susceptible patients, detecting predictive CTPA indices in identifying high-risk patients would be of high value to reduce the mortality rate [ 3 ]. Within the last several years, spiral computed tomography angiography (SCTA) of the pulmonary arteries has emerged as a noninvasive angiographic modality for the evaluation of patients with suspected pulmonary embolism (PE). Methods: Ninety suspected cases of Pulmonary Embolism (PE) scheduled for CTPA were randomly and equally divided into 3 groups (group A, B and C). Radiopaque contrast material is injected, and the pulmonary arterial tree is visualized on a series of rapidly exposed chest radiographs ( Fig. It is a preferred choice of imaging in the diagnosis of PE due to its minimally invasive nature for the patient, whose only requirement for the scan is an intravenous line. CT Scan angiography of the thoracic aorta (SIEMEN) - CLVT Động mạch chủ ngực - Duration: 12:19. CT angiography (CTA) is considered the gold standard in diagnosis of PE . CT pulmonary angiogram (CTPA) is a medical diagnostic test that employs computed tomography (CT) angiography to obtain an image of the pulmonary arteries.Its main use is to diagnose pulmonary embolism (PE). Using contrast injected into the blood vessels, images are created to look for blockages, aneurysms (dilations of walls), dissections (tearing of walls), and stenosis (narrowing of vessel). The pulmonary vasculature may be evaluated with various invasive and noninvasive methods. Subtraction computed tomography (SCT) is a technique that uses software-based motion correction between an unenhanced and an enhanced CT scan for obtaining the iodine distribution in the pulmonary parenchyma. Keywords: Computed tomography pulmonary angiography Diagnosis Pulmonary embolism Introduction Computed tomography pulmonary angiography (CTPA) is currently the first line imaging technique as recommended by Computerized tomography pulmonary angiography (CTPA) is the gold standard technique in detecting PE with high sensitivity and specificity . Reduced z-axis technique for CT Pulmonary angiography in pregnancy—validation for practical use and dose reduction @article{Shahir2015ReducedZT, title={Reduced z-axis technique for CT Pulmonary angiography in pregnancy—validation for practical use and dose reduction}, author={Kaushik Shahir and Jonathan M … In 1998, a combined technique of CT venography and CT pulmonary angiography (CTVPA) was initially described. This review discusses the technique of helical CT pulmonary arteriography, criteria for interpretation, and its clinical application with particular emphasis on problems common in the geriatric popution. Eighty-four CTPA exams performed on pregnant women during 2004–2012. OBJECTIVE: To determine the overall sensitivity and specificity for CT pulmonary angiography (CTPA) in the diagnosis of pulmonary emboli (PE) using a meta-analysis of the published literature. CT pulmonary angiogram (or CTPA) is a special test used primarily to look for the presence of pulmonary embolism (blood clots in the lung).. How is a CTPA performed? CT dose index (CTDIvol) and dose length product (DLP) were obtained. In 1980, 3 million CT scans were done in the United States, which increased to 70 million in 2007 (3, 4). Methods: 47 patients (25 females) with mean age 69 years (range 41–82 years) referred for contrast-enhanced chest CT were prospectively included in this Phase IV clinical drug trial. PURPOSE: A bolus injection of contrast medium (CM) in CTPA over-elevates the density in the veins. 3.13 ). To perform CT pulmonary angiography (CTPA) using a minimal amount of iodinated contrast media. 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